• Re:what is wrong with RF people?

    From Martin Rid@21:1/5 to john larkin on Tue Oct 29 18:56:34 2024
    john larkin <jl@glen--canyon.com> Wrote in message:r
    https://www.digikey.com/en/products/detail/macom-technology-solutions/MASW-007107-TR3000/4429770Apparently "DC" means 2 GHz to these people. They test it with 8 pFseries caps on the input and output.I once used a Maxim part rated DC to 10 GHz, that
    absolutely screwedup below 100 MHz.A lot of "DC" parts are actually characterized down to 9 KHz, becauselots of spectrum analyzers only go that low.Grrrrr.

    O yes, they are different. No one would really understand, until
    you work with one.

    Cheers
    --


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  • From john larkin@21:1/5 to All on Tue Oct 29 15:41:52 2024
    https://www.digikey.com/en/products/detail/macom-technology-solutions/MASW-007107-TR3000/4429770

    Apparently "DC" means 2 GHz to these people. They test it with 8 pF
    series caps on the input and output.

    I once used a Maxim part rated DC to 10 GHz, that absolutely screwed
    up below 100 MHz.

    A lot of "DC" parts are actually characterized down to 9 KHz, because
    lots of spectrum analyzers only go that low.

    Grrrrr.

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  • From john larkin@21:1/5 to martin_riddle@verison.net on Tue Oct 29 16:17:58 2024
    On Tue, 29 Oct 2024 18:56:34 -0400 (EDT), Martin Rid <martin_riddle@verison.net> wrote:

    john larkin <jl@glen--canyon.com> Wrote in message:r
    https://www.digikey.com/en/products/detail/macom-technology-solutions/MASW-007107-TR3000/4429770Apparently "DC" means 2 GHz to these people. They test it with 8 pFseries caps on the input and output.I once used a Maxim part rated DC to 10 GHz, that
    absolutely screwedup below 100 MHz.A lot of "DC" parts are actually characterized down to 9 KHz, becauselots of spectrum analyzers only go that low.Grrrrr.

    O yes, they are different. No one would really understand, until
    you work with one.

    Cheers

    I found one Pericom RF switch that is "True DC to 8 GHz", which may be
    an improvement.

    So DC means AC, but "True DC" means DC in the RF world.

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  • From Cursitor Doom@21:1/5 to john larkin on Wed Oct 30 23:53:40 2024
    On Tue, 29 Oct 2024 16:17:58 -0700, john larkin wrote:

    On Tue, 29 Oct 2024 18:56:34 -0400 (EDT), Martin Rid <martin_riddle@verison.net> wrote:

    john larkin <jl@glen--canyon.com> Wrote in message:r
    https://www.digikey.com/en/products/detail/macom-technology-solutions/ MASW-007107-TR3000/4429770Apparently
    "DC" means 2 GHz to these people. They test it with 8 pFseries caps on
    the input and output.I once used a Maxim part rated DC to 10 GHz, that
    absolutely screwedup below 100 MHz.A lot of "DC" parts are actually
    characterized down to 9 KHz, becauselots of spectrum analyzers only go
    that low.Grrrrr.

    O yes, they are different. No one would really understand, until
    you work with one.

    Cheers

    I found one Pericom RF switch that is "True DC to 8 GHz", which may be
    an improvement.

    So DC means AC, but "True DC" means DC in the RF world.

    ISTR being told here that 40Mhz was "practically DC" (but I suppose today
    it probably is!)

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  • From John S@21:1/5 to Cursitor Doom on Sun Nov 10 18:58:46 2024
    On 10/30/2024 6:53 PM, Cursitor Doom wrote:
    On Tue, 29 Oct 2024 16:17:58 -0700, john larkin wrote:

    On Tue, 29 Oct 2024 18:56:34 -0400 (EDT), Martin Rid
    <martin_riddle@verison.net> wrote:

    john larkin <jl@glen--canyon.com> Wrote in message:r
    https://www.digikey.com/en/products/detail/macom-technology-solutions/
    MASW-007107-TR3000/4429770Apparently
    "DC" means 2 GHz to these people. They test it with 8 pFseries caps on >>>> the input and output.I once used a Maxim part rated DC to 10 GHz, that >>>> absolutely screwedup below 100 MHz.A lot of "DC" parts are actually
    characterized down to 9 KHz, becauselots of spectrum analyzers only go >>>> that low.Grrrrr.

    O yes, they are different. No one would really understand, until
    you work with one.

    Cheers

    I found one Pericom RF switch that is "True DC to 8 GHz", which may be
    an improvement.

    So DC means AC, but "True DC" means DC in the RF world.

    ISTR being told here that 40Mhz was "practically DC" (but I suppose today
    it probably is!)

    I thought it might be 100MHz. After all, the wavelength is almost 10
    feet long!

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